Challenge Indoor:

The facility had high humidity and corrosive environment for pool area exhaust.

Solution Indoor:

The high humidity and corrosive environment for pool area exhaust resulted in the following solutions:
a. 304 stainless steel wash-down exhaust air section with interior liners to reduce corrosion.
b. Special epoxy coating on exhaust air fans to reduce corrosion.
c. Enthalpy wheels to recover energy from high temperature and humidity exhaust air.

CFM

75,000

35,000

24,000

12,000

10,000

7,650

Supply Fans

6 Plenum

4 Plenum

3 Plenum

1 Plenum

1 Plenum

1 Plenum

Return Fans

6 Plenum

4 Plenum

3 Plenum

No

No

No

VFD

Yes

Yes

Yes

Yes

Yes

Yes

Pre-Heat Coil – 50% P.Glycol

Yes

Yes

No

No

No

No

Heating Coil – 50% P.Glycol

Yes

Yes

Yes

Yes

Yes

Yes

Cooling Coil – Chilled Water

No

No

Yes

Yes

No

No

Pre-Filter

MERV 8

MERV 8

MERV 8

MERV 8

MERV 8

MERV 8

Final Filter

MERV 14

MERV 14

MERV 14

MERV 14

No

No

Heat Recovery

Enthalpy Wheel

Enthalpy Wheel

No

No

No

No

Mixing Section

No

No

Yes

Yes

No

No

Silencer

No

No

Yes

No

No

No

Humidifier

No

No

Steam

No

No

No

Air Blender

Yes

Yes

Yes

No

No

No

Indoor/Outdoor

Indoor

Indoor

Indoor

Indoor

Indoor

Indoor

Service Corridor

No

No

No

No

No

No

Wall Thickness

4”

4”

4”

4”

4”

4”

Outer Casing

16 Ga. Satin Coat

16 Ga. Satin Coat

16 Ga. Satin Coat

16 Ga. Satin Coat

16 Ga. Satin Coat

16 Ga. Satin Coat

Inner Casing

304 SS in E/A section, 22 Ga. Galvanized in other sections

304 SS in E/A section, 22 Ga. Galvanized in other sections

22 Ga. Galvanized, perforated in fan sections

22 Ga. Galvanized, perforated in fan sections

22 Ga. Galvanized

22 Ga. Galvanized

Challenge Outdoor:

Extreme cold weather climate up to -40C/F

Solution Outdoor:

Extreme cold weather resulted in the implementation of the following solution:
a. 50% propylene glycol for freeze protection on the heating coils.
b. 4” wall thickness for increased R-Value.
c. Air blenders provided to prevent air stratification.
d. Service corridors with unit heaters for rooftop units provide shelter for maintenance staff, and a heated enclosure for piping connections and natural gas humidifiers.
e. Enthalpy wheels to recover energy from exhaust and temper the cold incoming outside air.